Question

a 2.80 kg mass is dropped from a height of 4.50 m. find its kinetic energy(KE) at the moment it is dropped

Answer 1

Zero

Step-by-step explanation:

The kinetic energy of an object is given by

`K=(1)/(2)mv^2`

where

m is the mass of the object

v is its speed

In this problem, the mass of the object is

m = 2.80 kg

while its speed when it is dropped is zero, so

v = 0

And therefore

K = 0

So, its kinetic energy is zero.